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<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html">tracking an old regression</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246292865" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jane Lusby <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246292865">(Jul 16 2021 at 23:55)</a>:</h4>
<p>Hey, the libs team recently discussed <a href="https://github.com/rust-lang/rust/issues/53823">https://github.com/rust-lang/rust/issues/53823</a> when going through our backlog of regressions and decided that there's nothing for us to do since the current plan is to wait for llvm to fix the issue upstream in <a href="https://bugs.llvm.org/show_bug.cgi?id=40027">https://bugs.llvm.org/show_bug.cgi?id=40027</a>. We're interested in getting this off of our plate since there's not really anything to do on the libs side of things and we're not really sure how to properly backburner the issue. Our current thought is to untag T-libs and tag T-compiler but I wanted to coordinate to make sure that's appropriate.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366446" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366446">(Jul 18 2021 at 08:20)</a>:</h4>
<p>if it involves LLVM, I'm surprised it's T-libs and not T-compiler</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366453" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366453">(Jul 18 2021 at 08:21)</a>:</h4>
<p>ah it started out as a library perf regression issue and it was never properly transitioned?</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366465" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366465">(Jul 18 2021 at 08:21)</a>:</h4>
<p>(well, s/never/until 4 days ago/, heh)</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366530" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366530">(Jul 18 2021 at 08:23)</a>:</h4>
<p>ooooh I see, the libs thing was a "Plan B", <em>after</em> filing the LLVM issue <a href="https://github.com/rust-lang/rust/issues/53823#issuecomment-447846472">https://github.com/rust-lang/rust/issues/53823#issuecomment-447846472</a></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366635" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366635">(Jul 18 2021 at 08:26)</a>:</h4>
<p><span class="user-mention" data-user-id="220273">@Jane Lusby</span> okay, having read through the entire history (which I should've done first, my bad), this comment seems convinced the original reason for the T-libs tagging (i.e. a "Plan B" in library code) isn't actionable <a href="https://github.com/rust-lang/rust/issues/53823#issuecomment-873570838">https://github.com/rust-lang/rust/issues/53823#issuecomment-873570838</a></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366646" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366646">(Jul 18 2021 at 08:26)</a>:</h4>
<p>so yeah, moving it <del>back</del> to T-compiler seems appropriate</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246366743" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246366743">(Jul 18 2021 at 08:29)</a>:</h4>
<p><span class="user-mention" data-user-id="220273">@Jane Lusby</span> I guess if you wanted to be safe, keep both T- labels (which I guess is the current state of the issue) and nominate so the T-compiler meeting can confirm the handover. I kinda wish we had something less clunky for quick things like these, but at least it's not an MCP</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/tracking%20an%20old%20regression/near/246473058" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Jane Lusby <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/tracking.20an.20old.20regression.html#246473058">(Jul 19 2021 at 15:49)</a>:</h4>
<p><span class="user-mention silent" data-user-id="119009">eddyb</span> <a href="#narrow/stream/131828-t-compiler/topic/tracking.20an.20old.20regression/near/246366743">said</a>:</p>
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<p><span class="user-mention silent" data-user-id="220273">Jane Lusby</span> I guess if you wanted to be safe, keep both T- labels (which I guess is the current state of the issue) and nominate so the T-compiler meeting can confirm the handover. I kinda wish we had something less clunky for quick things like these, but at least it's not an MCP</p>
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<p>that sounds perfect, I'll nominate the issue for yalls next meeting, tyty</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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